The Lokbox based PT Quad is a fin design by Santa Cruz shaper Pat Taylor. It’s much like the Canard Quad design that has been doing the rounds in many Speed Dialer and Speed Dialer-esque shapes these last few years but with a fuller template. As with these Canard Quad templates, you can see how the two fins together have a profile similar to a traditional keel fin. Use this fin set up if you feel underpowered with your current quad set.

Like the R5-R8 quad combo, the RS1-RS2 is another of the more recent quadfin offerings from Rainbow Fin Co. for the Lokbox fin system.

The RS1 has a full bodied 4.5″ leading fin much like the LB4 (so fuller than the R5) but has a trailing fin that is smaller than either the LB1 or the R8. The RS2 is only 3.75″ high, a whole .5″ shorter than either of those.

These are just a few situations where these fins would work well:
-On boards that have their fin boxes further back.
-On shapes with more pulled in tails.
-For riders that want to loosen up a board that use a fin set with a larger rear fin like the LB4-LB1 or the R5-R8.

Below you can compare the size and rake of the RS1 and RS2 (RS2 on top of RS1):

Above is a nice shot of the Lokbox R5-R8 Quadfin combination perched on a local reef. The R5-R8 is a set up that’s been made available more recently by Rainbow Fin Co. for the Lokbox fin system. Although the fin heights are the same as the LB4-LB1 combo, these templates are not as full in profile taking less power to turn with them. This means the LB4-LB1 may be the choice for a larger surfer (or someone with a real power oriented surfing style) while the R5-R8 may be good for someone of more average size. Of course fin box placement and board template should be considered in this equation as well.

The following image contrasts the templates of the two fins with the 4.25″ R8 resting on top of the 4.5″ R5 (stay tuned for some R5-R8 vs. LB4-LB1 contrast shots):

“Canard Cutaway Quad” is quite a mouthful but there are some interesting design elements highlighted by the language used in the name. A canard wing is a reference to a long, narrow foil. In this case, there are four of them. In the field of aerodynamics, a canard wing is known for high efficiency. With each pair of fins, a canard quad takes an outline similar to a traditional keel fin, and breaks it into two parts. The “Cutaway” aspect of the name highlights the bit of the trailing edge of the rear set of fins that’s been removed. This has the effect of loosening up the fins by narrowing the base.
The “Turbo” aspect of the fins means they have more outward cant (less “vertical” than a non turbo set). The cant puts the ends of the fins closer to the rail line of a shape they’re on. This loosens the board further but not at the sake of drive.